CbcBranchAllDifferent.hpp

// $Id$
// Copyright (C) 2004, International Business Machines
// Corporation and others.  All Rights Reserved.
// This code is licensed under the terms of the Eclipse Public License (EPL).

// Edwin 11/13/2009-- carved out of CbcBranchCut

#ifndef CbcBranchAllDifferent_H
#define CbcBranchAllDifferent_H

#include "CbcBranchBase.hpp"
#include "OsiRowCut.hpp"
#include "CoinPackedMatrix.hpp"
#include "CbcBranchCut.hpp"

/** Define a branch class that branches so that it is only satsified if all
    members have different values
    So cut is x <= y-1 or x >= y+1
*/

class CbcBranchAllDifferent : public CbcBranchCut {

public:
  // Default Constructor
  CbcBranchAllDifferent();

  /** Useful constructor - passed set of integer variables which must all be different
    */
  CbcBranchAllDifferent(CbcModel *model, int number, const int *which);

  // Copy constructor
  CbcBranchAllDifferent(const CbcBranchAllDifferent &);

  /// Clone
  virtual CbcObject *clone() const;

  // Assignment operator
  CbcBranchAllDifferent &operator=(const CbcBranchAllDifferent &rhs);

  // Destructor
  ~CbcBranchAllDifferent();

  /// Infeasibility - large is 0.5
  virtual double infeasibility(const OsiBranchingInformation *info,
    int &preferredWay) const;

  /// Creates a branching object
  virtual CbcBranchingObject *createCbcBranch(OsiSolverInterface *solver, const OsiBranchingInformation *info, int way);

protected:
  /// data

  /// Number of entries
  int numberInSet_;
  /// Which variables
  int *which_;
};
#endif

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